I have the 1266TC, LCD4 and the Caldera with me right now. Granted, I am still in the honeymoon phase with the Caldera but I think my listening is fairly good for my age (early 30s) and hear up to 18 KHz. That's relevant because of the upper end zing of the TC (and thankfully did not kill my hearing when I used to play the drums in my early years). That said, I would put the Caldera above the other two for a long-term relationship. I can listen to the Caldera, then the LCD4, and last the TC in that order. The most natural and pleasing is definitely the Caldera. Here's I would delineate them for me - the TC is the most interesting for shorter bursts (unparalleled bass impact and a bit too spicy upper zing ). It has the most party fricks and so much fun. The LCD4 is one that I can turn it up, and I mean rock out unhealthy levels of volume to totally rock out to metal or thrash.
Neither are as natural with spectacular bass of the Caldera. Also, those who find it to have forward upper mid energy (I do not btw.), ZMF now has a green mesh to make it smoother and darker. I will get one but I have no intention of installing it. The Caldera is just right! It can be bombastic without being shrill or fatiguing (note I listen to a lot of heavy stuff; audiophile music rarely come on my playlists).
Btw. regarding "note weight" as in "when riffs were men" the of sound (yes, Susvara - looking at your delicate "audiophile" guitar riffs that made me sell you), Caldera has the meatiest of the bunch.
For my library dominated by a lot of Lamb of God, Sepultura, Pantera (well you get the idea), the Caldera easily takes the cake! Take a bow, ZMF!